In Situ Growth of Nanoparticles in Layered Perovskite La0.8Sr1.2Fe0.9Co0.1O4−δ as an Active and Stable Electrode for Symmetrical Solid Oxide Fuel Cells
In Situ Growth of Nanoparticles in Layered Perovskite La0.8Sr1.2Fe0.9Co0.1O4−δ as an Active and Stable Electrode for Symmetrical Solid Oxide Fuel Cells
复制标题
DOI：
10.1021/acs.chemmater.6b00071
复制
发表时间：
2016-04
影响因子：
8.6
通讯作者：
Jun Zhou;T. Shin;C. Ni;Gang Chen;Kai Wu;Yonghong Cheng;J. Irvine
中科院分区：
文献类型：
--
作者：
Jun Zhou;T. Shin;C. Ni;Gang Chen;Kai Wu;Yonghong Cheng;J. Irvine
与传统的沉积技术相比，在材料表面上原位生长纳米颗粒是设计新催化剂的更省时、更经济的方法之一。在还原条件下，钙钛矿晶格中的B位过渡金属阳离子可以部分脱溶为纳米颗粒，大大提高了催化活性。在这里，我们证明了在层状钙钛矿La0.8Sr1.2Fe0.9Co0.1O4±δ（LSFC）的表面上生长纳米颗粒，其可以用作中温对称固体氧化物燃料电池（IT-SSOFC）的氧化还原稳定和活性电极。因此，将适量的Co取代到层状钙钛矿中可以同时优化阴极和阳极性能。在空气和5%H2/N2中，800 °C时LSFC电极的极化电阻（Rp）分别为0.29和1.14 Ω cm ~ 2，比无Co的La_（0.8）Sr_（1.2）FeO_（4 ±δ）的Rp小得多。LSFC在空气中较低的极化电阻主要归因于其表面具有良好的导电性。
Compared to traditional deposition techniques, in situ growth of nanoparticles on material surfaces is one of the more time- and cost-effective ways to design new catalysts. The B-site transition-metal cations in perovskite lattice could be partially exsolved as nanoparticles under reducing conditions, greatly enhancing catalytic activity. Here, we demonstrate that growing nanoparticles on the surface of a layered perovskite La0.8Sr1.2Fe0.9Co0.1O4±δ (LSFC), which could be applied as a redox stable and active electrode for intermediate-temperature symmetrical solid oxide fuel cells (IT-SSOFCs). Substitution of a proper amount of Co into the layered perovskite can thus optimize cathode and anode performance simultaneously. For example, the polarization resistances (Rp) of LSFC electrode at 800 °C are 0.29 and 1.14 Ω cm2 in air and in 5% H2/N2 respectively, which are much smaller compared with the Rp of Co-free La0.8Sr1.2FeO4±δ. The lower polarization resistance for LSFC in air can be mainly attributed to th...